COOLING STRUCTURE OF MULTI-CYLINDER ENGINE

摘要

A cooling structure of a multi-cylinder engine is provided. The engine has cylinders and a cylinder block formed with a cylinder bore wall. The cooling structure includes a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall, a water pump for feeding a coolant to the water jacket, an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing the coolant to the water jacket, and a spacer member accommodated inside the water jacket. The spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body. The dividing wall extends in a circumferential direction at a position opposing the introduction port.

主权项

1. A cooling structure of a multi-cylinder engine having a cylinder block formed with a plurality of cylinders and a cylinder bore wall of the plurality of cylinders, comprising:
a water jacket formed in the cylinder block and defined by the cylinder bore wall and a jacket outer surface surrounding the cylinder bore wall; a water pump for feeding a coolant to the water jacket by being driven by the engine; an introduction portion formed in the cylinder block, having an introduction port opening to the jacket outer surface, and for introducing, to the water jacket, the coolant fed by the water pump; and a spacer member accommodated inside the water jacket, wherein the spacer member has a spacer main body surrounding the cylinder bore wall, and a dividing wall protruding toward the jacket outer surface from an outer circumferential surface of the spacer main body, and wherein the dividing wall extends in a circumferential direction of the spacer main body at a position opposing the introduction port, so as to partition at least a part of a space between the introduction port and the outer circumferential surface of the spacer main body into a cylinder head side space and a space on a side opposite from the cylinder head.